If You Suspect Infestation

Never attempt to treat excessive weed infestation with chemicals, other biological controls or mechanical cutting. If weed growth has increased on your shoreline, the New Hampshire Department of Environmental Services can assist in identifying a weed and helping you manage its presence.

Please take a sample of the weed, place it in a Ziploc bag with a moist towel, note where the sample was taken from, and deliver the sample to the NHDES office in Concord.